Feed mechanism for mixing-mills.



P. E. & H. Al WELTON.

FEED MECHANISM FOR MiXING MILLS.

APPLICAUON FILED N0v.3,1913.

l 3i 34%, Patented Am'. 6, 1915,

nutren sauras nanna orrron.

rm n. manon an'n'nnnr A. wELroN, or Amann, omo, 'Assrenons To K ATHARINE B. wELToN, F AKRON,

oHrp.

FEED MECHANISM FOR Specification of Letters Patent.

rammed apr. e, 1915.

Application led November 3, 19,13. Serial No. 798,806.

' T0 all 'whom it may concern:

Be it known that we, PARK E. WELTON and HARRY A. WnL'roN, citizens of the United States, and residents of Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Feed Mechanism for Mixing- Mills, of which the following is a full, clear, and exact description.

Vhen endless feed aprons are employed in connection with the mixing rolls o f a mixing mill, it is not only desirable that the mechanism associated with the apron shall be 'capable of so controlling its position that it will repeatedly return to the mixing rolls the material which passes between them, but it is also desirable that this mechanism be such that, when any batch of material has been satisfactorily mixed, the apron and its associated mechanism may be moved into such positions as will facilitate the removal fof such mixed material.

This invention residesv in the novel mechanism shown in the drawing and hereinafter described and claimed, which when combined with an endless feed apron will produce the desirable results above mentioned.

ln the drawings, Figure 1 is a vertical section on the nlane indicated by the line 1-1 on Fig. 2 of a mixing mill to which the present invention is applied; Fig. 2 is a sectional end elevation on the plane indicated bv the line 2 2 on Fig. 1. Fig. 3 is an enlarged sectional view ofthe grooved part of the roll 6, the section being at right angles to the axis of the roll and showing also a part `vof the feed apron and a part of the adjacent mixing roll. Referring to the parts by reference characters, 1 and 2 represent the mixing rolls of an ordinary rubber mixing mill. No attempt has been made to show the mechanism by which these rolls are turned, because that is no part of the present invention. It must be assumed, however, that suitable mechanism is associated with these rolls to cause them to turn at the proper rate in the direction indicated by the arrows placed adjacent to said rolls in F ig. 1..

in order that'any rubber mixing mill may Vbe quickly equipped with this invention, the

apron and the mechanism associated therewith are 'all mounted and supported on a pan B which maybe secured to the mixing mill frame work beneath the mixing rolls,

The endless feed apron 3 runs over three rolls 4, 5 and 6, whose axes are parallel with the axes of the mixing-rolls, and said rolls are so mounted that they may assume the operating position relative to mixing rolls which is shown in Fig. 1, whereby the apron is held against one of thel mixing rolls, and

- is caused to travel at substantially the same surface speed. .The roll 4 is mounted'in bearing pieces '7,- which preferably are mounted slidably on the pan, and are under the influence of springs 8 which act to yieldingly stretch the belt. Specifically, these bearing pieces are in the form of sleeves which embrace rods 9, which are fixed to the pan; and the springs 8 are located between these sleeves and collars 10 on said rods. y The roll 5 is mounted in bearing brackets l2 which are fixed to the pan. Two swinging arms 13'are pivoted to these same brackets on an axis which is"'s'ubstantially coincident with the axis of the roll 5, and extendtherefrom upward at an angle toward the mixing roll 1. On each of these arms a sleeve 15 is slidably mounted, and these sleeves are so constructed that the roll 6 is rotatively mounted in them at its ends.

At the upper end of each arm 13, a sheave 16 is mounted. A cable 17 is fixed to each sleeve 15 and extends upward over sheave 16, and thence down to agguide sheave 18 mounted in brackets 19 which are secured to the under side of the pan. These two cables are wound respectively on two drums 20,' which are' fixed to a shaft 21,-said shaft being mounted in brackets 22 which are fixed to the under side of the pan.

Two fluid pressure cylinders 23 are fixed to the `under side of the pan. A rack 24 is fixed to the piston rod 25 vof each of those cylinders. rEhe racks are'supported by the brackets 22, and each engages with a pinion 26 which is fixed to shaft21. Y i

By admitting compressed air or steam to the left end of these cylinders, the Winding drums 20 are turned so as to wind up the cables 17, and this will draw up the two bracket sleeves 15, and thereby pull the feed apron against the mixing roll 1; and also the arms 13 will be swung toward said mixing roll, so as to cause the feed apron to wrapitself around s'aid mixing roll to the extent permitted by the length of the apron;

When the mixed material is to be .removed, the winding drums are turned in the reverse direction by the racks and Huid pressure cylinder, and the two arms 13'and parts carried thereby are swung 'to the left (as shown in Fig. 1),-to any desired position.

It is essential that, to get the best results, the guide sheaves-18 shall be fairly near to the pivots of the arms 13,-so that the pull of the cables upon said arms shallnot be at a very great angle to the armsl -In fact, the heavier and lumpier the material which is 'being mixed, the nearer should these cables be to the axis of said arms. a*Ihis gives to the arms andthe roll mounted in them, the ,necessary freedom of motion, as the lumpy material is being covered by the apron between it and the mixing roll.

Some sort of a guideto keep the apron from being moved endwise of the supporting rolls by the peculiar action of the different sized lumpsfof material is necessary. To accomplish this result, a narrowstrip 25 of suitable material, such as leather or Hexible chain is secured to the inner surface of the belt, and each of the three feed rolls is .l

formed with' a circumferential groove, E26a in its periphery vfor the reception off this guide4 strip. We have found, howeveigthat it will not do to apply this guide strip at or in a stretched condition. The aprons whichare used are made of canvas or rubber beltingreand this will be stretched use, and it will not dq to secure this guide strip so that it willinterfere with the even stretching of said apron. guide strip is secured at short intervalsl to the apron so that between those points of connection, ythe guide strip is loose or looped:

When so secured it makes rather a better guide strip, than it would if `it were.laid fiat against 'the apron in the first. instance: and it does not interfere with stretching of the apron.

lBIS

" drawing said bracket sleeves upward on said arms and for swinging said arms to-' ward the mixing rolls.

2. In combination with the mixing rolls' of a mixing mill. an e less feed apron therefor, three rolls over 'Lwhich said apron runs,-two of said rollslloei'ng located in planes below the mixing rolls-two pivoted arms which when in' operative positiony ex- Therefdre this tend-upward at an angle toward the mixing rolls, two bracket sleeves which are slidably mounted on said arms,-the third apron roll A being extended between/.andv mounted on these bracket sleeves, sheaves mounted uponv the upper ends of said arms, winding drums, and cables which'are fixed to said bracket sleeves and extend over said sheaves and are wound upon said drums.

8. ,In combination with the mixing rolls of 'a mixing (mill, an endless feed apron therefor, three rolls over which said apron runs,-two of'said rolls being located in planes below the mixing rolls,-tw0 pivoted arms which when in operative position ex tend upward at an angle toward the mixing rolls, two bracket sleeves which are slidably mounted on said arms-the third apron roll being extended between andmounted on these bracket sleeves,v sheaves mounted on the upper end of said arms, guidesheaves located adjacent to the pivots of said arms but between said pivots and the mixing rolls,

cables which are ixed tosaid bracket sleeves, and extend over the sheaves on the ends of `the arms, and under the other sheaves, and

winding drums upon which said cables may be wound.

4. In combination with the mixing rolls of a mixing mill', and a supporting member which is removably secured beneath said mixing rolls, and the following coperating parts which are supported by saidremovable supporting member, viz: two guide rods lo-Y cated below the mixing rolls and extending in directions at right angles to the axes of 'said rolls, two brackets" slidably mounted on said rods near one end thereof, an apron roll which extends between and is mountedin said'brackets, springs acting to yieldingly ond apron roll which is parallel with the iirst mentioned roll and is mounted near the opposite ends of said guide rods, two arms pivoted on axes which-are substantially coincident with the axisi of the last mentioned apron roll, two bracket' sleeves which are slidably mounted on said arms, a third apron which extends between and is mounted in said bracket sleeves, sheaves on the upper ends of 'said arms, cables fixed to saidbracket sleeves and extending over said sheaves and downward therefrom,- guide sheaves'under which said cables run, means for takingr in 'and paying out'said cables,'and an endless feed apron which runs around the three apron rolls specified.

5. In combination with the mixing rolls of a mixing mill` three apron rolls, two of which are located in planes below the mixing rolls, two pivoted arms in which the vother apron roll is mounted, means for swinging. saidy arms toward the adjacent mixing `roll,'-each of sald rolls having a resist the movement of said brackets toward the opposite ends of said guide rods, a seccircumferential groove in its periphery, and a streteliable feed apron which embraces and runs over all of seid eecl rolls; said apron.

lim/'ing secured at intervals to its inner face a guide strip adapted to run in said circurrereritiai groovesj the said guide strip betwee the points at which it is connected with the belt being arranged in loose loops.

G. in combination With the mixing rolls of e mixing mills an endless feed apron therefor, three rolls over which seid apron i'uns,-two of said rolls being located in planes below the mixing rolls,-two pivoted arms whiche when in operative position, eX- tericl upward et an angle toward the mixing patent :may Tse obese for :Tre @este eee'fi,

rolls, two bearing brackets which are slid;- ebly mounted on said arms, the third apron roll being extended between end mounted in said bearing brackets, and 'means for inde pendentlv applying yielding pressure to said bearing brackets to move them upward upon their supporting arms.

In testimony whereof, We hereunto eii; our signatures in the presence of two Witmesses.

' 'PARK E. WELTN.

HARRY A. WELTGN. Witnesses oy ereseim the @Sommiesoner of Estonie, 

